IclcdDisplay() turns the LCD display on or off.

bool IclcdDisplay(bool on = true, uint8_t device = 0)

bool IclcdBegin(uint8_t address, uint8_t columns, uint8_t rows,
                bool backlight = true, uint8_t device = 0);
bool IclcdClear(uint8_t device = 0);
bool IclcdHome(uint8_t device = 0);
bool IclcdSetCursor(uint8_t column, uint8_t row, uint8_t device = 0);
bool IclcdDisplay(bool on = true, uint8_t device = 0);
bool IclcdCursor(bool on = true, uint8_t device = 0);
bool IclcdBlink(bool on = true, uint8_t device = 0);
bool IclcdBacklight(bool on = true, uint8_t device = 0);
bool IclcdScrollLeft(uint8_t device = 0);
bool IclcdScrollRight(uint8_t device = 0);
bool IclcdTextDirection(bool leftToRight = true, uint8_t device = 0);
bool IclcdAutoscroll(bool on = true, uint8_t device = 0);
bool IclcdCreateChar(uint8_t location, const uint8_t charmap[8],
                     uint8_t device = 0);
bool IclcdWrite(uint8_t value, uint8_t device = 0);
bool IclcdCommand(uint8_t command, uint8_t device = 0);
bool IclcdPrint(...);

• PCF8574 connections use the same mapping as the existing CLCD library: P0=RS, P1=R/W, P2=Enable, P3=backlight, P4~P7=LCD D4~D7.
• Verify the LCD module's actual I²C address using its settings and I²C scan results.
• SDA/SCL can share the bus with other I²C devices, but addresses must not overlap.
• Do not run Wire transfers or I²C slave callbacks concurrently with Iclcd…(). Iclcd transfers run at 100 kHz and then restore the previous TWI settings.
• On MPAINO, using D20/D21 for external interrupts prevents simultaneous I²C use.
• IclcdCommand() can change the LCD state directly. Use it only if you understand HD44780 commands.

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